Voicemail that is grayed appears on iphone

See screenshot.  Had my boss show me his voicemail on his iphone.  Shows a grayed out voicemail and when you try and delete it, it will delete the voicemail behind it.  Always shows up.  I have it figured out after a reboot (it went away)  but I wanted to know if anyone knows why it did this.
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JohnBusiness Consultant (Owner)Commented:
That falls in the area of "who knows?"   The voice mail involved may not have cleared out correctly (user error or iPhone error). Then a restart of the phone clears it out.  

If it is working correctly, there is not much more you can do.

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JohnBusiness Consultant (Owner)Commented:
Thanks. I hope you did not mind "Who knows?" but it would be really hard to track down any physical reason.
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